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João Otavio

@joootavio1

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Golang-focused software engineer building scalable, high-performance distributed systems with product-driven impact.

Brazil

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What I'm looking for

I seek roles where I can design scalable backend systems, collaborate with product teams, improve system performance and developer experience, and drive reliable delivery.

I am a Golang specialist with four years of focused experience building high-performance APIs, microservices, and event-driven architectures that solve business problems at scale.

I have designed and optimized billing, metering, ingestion, and asynchronous processing systems, improving throughput and reducing latency using technologies like gRPC, Kafka, ClickHouse, and PostgreSQL. I regularly collaborate with Product and Business teams to align technical solutions to customer value and lead engineering initiatives that improve performance, reliability, and developer experience.

I prioritize software quality through unit, integration, contract, and end-to-end testing, and I bring strong database architecture, cloud deployment, and CI/CD experience to reliably deliver production systems.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Wellhub

Nov 2024 - Present (1 year 4 months)

Designing and developing high-performance Golang APIs and background workers, replacing REST calls with gRPC streaming to drastically increase throughput and reduce latency; implemented parallel distributed pipelines and comprehensive E2E tests to improve deployment confidence.

Golang gRPC PostgreSQL Docker Kubernetes AWS Distributed Systems Automated Testing

Software Engineer

Magalu Cloud

Nov 2022 - Nov 2024 (2 years)

Developed Cloud Metering & Billing ecosystem handling millions of monthly transactions; implemented event-driven pipelines with Kafka and ClickHouse to increase throughput and reduce billing latency while standardizing gRPC contracts and tests.

Golang Kafka Clickhouse PostgreSQL Redis gRPC Docker Kubernetes Event Driven Architecture

Software Engineer

AppMoove

Aug 2021 - May 2022 (9 months)

Built and optimized microservices for a large-scale ticket e‑commerce and event management platform, including authentication, payments, and API gateway integrations; proposed architectural improvements using gRPC and messaging systems.

TypeScript NestJS GraphQL gRPC Kafka NATS PostgreSQL Docker Kubernetes

Back-end Developer

CATI Jr.

Apr 2020 - Feb 2022 (1 year 10 months)

Delivered backend features across three projects including enterprise management and agronomy marketplace; designed database schemas and REST APIs to improve maintainability and scalability through modularization.

Express Knex PostgreSQL REST APIs API Design Database Modeling